All that really needs to happen is someone writes a patch for
nautilus (GNOME Files) to give a more helpful message when someone double-clicks on an AppImage (or on any ELF binary) that doesn’t have execute permission. The message could be something like:
Execute this file as a program?
For security reasons, this program currently does not have permission to run on your computer. If you know where it came from and trust the source, click here to grant permission.
A message like this should pop up even if the user is running
appimaged, in my opinion. This is equivalent to the warning given on a Mac when the user tries to run an untrusted